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BUSINESS COMBINATIONS - Narrative (Details)
$ in Thousands
3 Months Ended
Jul. 01, 2019
USD ($)
branch
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 931,947 $ 501,308 $ 931,637
Other noninterest income   6,083 $ 3,593  
Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Number of bank branches | branch 62      
Number of stock for each share of Ameris common stock converted (in shares) | shares 0.80      
Ameris Bancorp common shares issued (in shares) | shares 22,181,522      
Issuance of common stock in acquisitions $ 869,294      
Goodwill 430,800 430,807    
Loans 3,510,000 $ 3,511,645    
Loan discount $ 75,800      
Loan discount, percent 2.11%      
Purchased credit-impaired loans acquired $ 120,700      
Cash exchanged for shares 19      
Consideration transferred $ 869,313      
Georgia | Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Number of bank branches | branch 46      
Florida | Fidelity Southern Corporation        
Business Acquisition [Line Items]        
Number of bank branches | branch 16